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Using Sine,Cosine,and Tangent to find missing sides of a TRIANGLE

658 views · Published 14 June 2014 · 15:18 · Indexed 29 October 2026

Channel: MooMooMath and Science · 2014 · Education

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Learning how to use the trig functions
Reviewing the steps
1.  Find the reference angle.
2. Label OPPOSITE, ADJACENT, HYPOTENUSE 
3. Which two do you have?  Which function is it?
4. Set up the ratio 
5. Solve it!
5:11 Practice problem 1 Deciding the functions
6:30 Practice 2 Find opposite side using tangent
7:45 Practice problem 3 using cosine
9:53 Solving Tan 52/1 = x/12
12:33 Solving Sin48/1=x/17
13:39 Solving Tan72/1 = x/34
15:03 Solving cosine 25/1  = 7/x
17:22 Reviewing using trig functions
1. Set up the ratio:         
2.  Cross multiply.  Use your calculator by entering:
TRIG FUNCTION   ANGLE    ENTER
3.   Solve.
If you need help in trigonometry I have put together a trigonometry unit. This is one video of the trigonometric unit that contains 14 videos, along with a note taking guide for each video, Click here for the table of contents:
http://www.moomoomath.com/trigonometry-problems.html

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